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Change methods not using its bound instance to staticmethods #1

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Change methods not using its bound instance to staticmethods #1

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6 changes: 4 additions & 2 deletions decisiontree.py
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,8 @@ def __init__(self, trainingData, maxDepth):
'''
S : is a Series
'''
def selfEntropy(self, S): # S is a pandas::Series
@staticmethod
def selfEntropy(S): # S is a pandas::Series
value_probabilies = S.value_counts() / len(S)
return - ( value_probabilies * value_probabilies.apply(math.log2) ).sum()

Expand All @@ -23,7 +24,8 @@ def selfEntropy(self, S): # S is a pandas::Series
-> returns the conditional entropy H(Y | X) using :
sum(p(x and y)* log(p(x) / p(x and y)) )
'''
def conditionalEntropy(self, X_Y:list):
@staticmethod
def conditionalEntropy(X_Y:list):
# Series of the form (index = (X,Y), value = P(x and y) )
probability_XandY = X_Y.groupby(list(X_Y.columns)).size() / len(X_Y)
probability_X = probability_XandY.groupby(level=0).sum()
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